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The accelerator-pump circuit adds fuel when abrupt throttle-position changes demand additional fuel to cover up a loss of signal to the main circuit. Without an accelerator-pump circuit, the engine would hesitate whenever quick changes in throttle position occurred.
Circuit City

 The accelerator-pump circuit adds fuel when abrupt throttle-position changes demand additional fuel to cover up a loss of signal to the main circuit. Without an accelerator-pump circuit, the engine would hesitate whenever quick changes in throttle position occurred.  View Related Article

 

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